Self priming pump



mmh 15, 1932.

J. T. JANl-:TTE

SELF PRIMING PUMP Filed April 18. 195o Patented Mar. 15, 1932l PATENT4 oF-FicE JOHN '1'. JANETTE, OF CHICAGO, ILLINOIS SELF PRIMING PUMP Application led April 18,

This invention relates in general to a pum l priming device, and has more particular re erence to a rotary pump, and to rotary drivin mechanism for a pump.

ne of the principal objects of the invention is in the provision of means for storing y a liquid during'the action of a pump,`which is used for priming the pump when the driving mechanism therefor is actuated after stopping the pump. v

A further object of the invention is in the provision of means for providing a liquid 'seal for a pump which is automatically actuated when the pump driving mechanism is operated.

A still further object of the invention is in the provision of a liquid seal for the discharge side of a pump which allows the escape of air therethrough; so that the pump in operation will tend to form a vacuum which will lift the liquid to be pumped from a remote container, and thereby draw the liquid therethrough in the ordinary manner.

A further object of the invention is in the provision of' a pump priming means whlch will maintain the priming liquid in a position where it cannot be withdrawn through the pump and sucked back into the liquid container, but will be ready for use whenever the operating mechanism is started.

Other objects of the invention will appear hereinafter, the accompanying drawings illustrating a preferred 'embodiment of the invention. f

In the drawings Fig. 1 is a side elevation, with many of the parts shown in section, of a pump lmechanism illustrating this invention; Fig. 2 is a sectionalview taken on the line 2-2 of Fig. 1; and Fig. 3 is a detail View illustrating a modification.

In the operation of a pump for supplying liquid, it is frequently found that when the pump stops, the liquid in the pump, or on the intake side of the pump flows, or is sucked -backwardly into, the receptacle from which it was pumped; leaving the pumpdry or without suilicient liquid in the pump mechanism to form an air seal or to act as a primer wtln' the pumping mechanism is again actua l 1930. Serial No. 445,408.

.The present invention is designed to provide a priming device in which a reserve of liquid is contained suiicientto forma liquid seal for the pump as soon as the pump'is started, the liquid being contained in a recep- 55 tacle from which it is thrown or discharged when the ated.

Referring now more particularly to the pumpl driving mechanism is actuvdrawings, a pump mechanism is shown mounted in a receptacle 4, which has a discharge outlet 5. In the receptacle isa casing 6, having discharge openings 7 adjacent the. upper end, with a pump 8 secured to the bottom of the casing and connnunicating, for

pumping liquid to the casing, through a .is secured to the shaft 10 by means of a key 17, the gears fitting closely and through part of their periphery in a casing 18, which has an inlet chamber 19 at one side, andan outlet 80 chamber 20 at the other side of the gears. The outlet 20 communicates with the opening 9 in the bottom of the casing, and a liquid inlet pipe 21 is connected to the inletchamber i 19 of the pump casing. The pipe 21 extends 85 outside of the receptacle'i, and is provided if desired with a strainer 22, which has a priming vent 23, the strainer in turn kbeing connected -by meansA of a pipe 24 to a source of liquid supply, which may be at some disthereof.

'Attached to the pump driving shaft'is a tance from 'the pump and below the level 'receptacle 25, preferably annular in shape,

and having a central hub portion 26, of the same height as the outer edges 27 thereof, to form a ring-shaped container which rotates with the shaft to which the hub portion may be connected by pressing it tightly thereonor by means of a pin or rivet 28.

When the pump is operated by means of the motor 13, liquid is drawn through the pipes 24 and 21, and discharged from the chamber through the opening 9, filling the base of the casing 6 until the liquid pumped is discharged through the opening 7 `into the container 4.-. When the pump is stopped the liquid in the casing 6 below the opening 7 may drain backwardly through the pump and through the pipes 2l and 24:, but an amount of liquid to ill the receptacle will be retained therein. Even though the pump is drained dry of liquid, this priming receptacle 25 will still hold an amount sufficient to prime the pump when the pump driving mechanism and the pump is again started. Thisliquid will be thrown out of the priming receptacle 25 as soon as the driving motor 13 is started, the liquid drainingthrough the opening 9 in the bottom of the casing 6 and filling the discharge chamber 20, thereby' forming a liquid seal which prevents air from passing through the pump in a reverse direction, and causes the pump to discharge air through the liquid seal tending to form a vacuum in the inlet chamber 19 and ply pipes lconnected therewith.

Instead of having the receptacle secured to the shaft as shown in Ilig. 1, a circular rece ptacle may be secured in the casin 6, as shown in F ig. 3, the shaft 10 carrying an arm or agitator 31, which engages the liquid in the receptacle 30, and discharges it therefrom when the motor is operated for priming the pump after the pump has been stopped and is again started.

With these constructions sufficient liquid is contained in the receptacle in casing 6, so that i even though all the other liquid drains out of or is sucked backwardly through the pump, the rotationof the motor and pump shaft 10 will discharge the liquid from the priming receptacle to, form a liquid seal for the pump.

I claim: e 1. A device 'of the character set forth comprising pumpl mechanism, rotary driving means for the pump mechanism, and means associated with the driving mechanism for catching a uantity ofliquid which is delivered thereto y the pump when o erating and for discharging the liquid there rom into the discharge side only of the pump when the driving means is started. i

the supreceptacle to provide a liquid seal for the discharge side of the pump when the pump is started.

4. The combination with a pump, of rotary operating means therefor, a receptacle carried by the operating means for receiving liquid discharged from the pump, the liquid being discharged from the receptacle when the operating means is started and returning to the discharge side of the pump to form a liquid seal therefor.

5. The combination with a pump, of a rotary driver therefor, a casing into which the pump discharges having an outlet above the bottom of the casing for obtaining a height of liquid-in the casing, a receptacle within the casing below the opening for receiving liquid and containing this liquid even though the remainder of the liquid in the casing passes outwardly through the pump, the liquid "in the receptacle being discharged therefrom when the driver is first actuated and ,fiowing to the bottom of the casing to provide a liquidv seal at thedischarge side of the pump.

' v(i. In a pumping system for drawing liquid from a. distance and discharging it into a receptacle, a casing having an inlet at the bottom and a'discharge at a distance above the bottom, a pump for drawing liquid from a distance and discharging it through the bottom of the casing, rotary driving means extending through the 'easing and a priming device comprising a receptacle secured to the driving means and located in the casing below the discharge opening therefor to receive liquid pumped into the casing and to retain it therein when the pump is stopped, the liquid being discharged from the receptacle.

when the'driving means is started after the pump has been stopped and the liquid therefrom drainin to the bottom of the casing to provide a liquid seal for the discharge side of the pump.

7. The combination with a. pump, of means for supplying a priming charge therefor at the discharge side of the pump and means actuated by the pump for discharging the charge into the pumpehamber at the disv charge side only as the pump is started. JOHN T. JANETTE.

pump for priming the same bythe operating means when said operating means is started.

3. The combination with a puin and rotary means for driving it, of a se f primer comprisin a receptacle for receiving liquid discharge by the pump, the driving means being operative to discharge liquid from the 

